Floor cleaning machine



FIG. 1 is a front, top and right side perspective view of a floor cleaning machine showing my new design;

FIG. 2 is a front, top and left side perspective view showing the design;

FIG. 3 is a front elevational view of the design;

FIG. 4 is a right side elevational view of the design;

FIG. 5 is a left side elevational view of the design; and,

FIG. 6 is a top plan view of the design.

The broken line showing of various elements in the drawings forms no part of the claimed design. 

CLAIM The ornamental design for a floor cleaning machine, as shown and described. 